feat: allow image storage location to be configured

[firstof9]

Proposed change

Adds option to change image storage location.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation update
• Adds a new shipper
• Update existing shipper

Additional information

• This PR fixes or closes issue: fixes ISSUE: Can't Write to Image Folder #975

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.98%. Comparing base (8608d22) to head (be4602a).
Report is 33 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #976      +/-   ##
==========================================
- Coverage   95.07%   93.98%   -1.09%     
==========================================
  Files           8        8              
  Lines        1482     1596     +114     
==========================================
+ Hits         1409     1500      +91     
- Misses         73       96      +23     

Files with missing lines	Coverage Δ
...stom_components/mail_and_packages/binary_sensor.py	97.36% <100.00%> (+0.18%)	⬆️
custom_components/mail_and_packages/config_flow.py	95.65% <100.00%> (-4.35%)	⬇️
custom_components/mail_and_packages/const.py	100.00% <100.00%> (ø)
custom_components/mail_and_packages/helpers.py	92.78% <100.00%> (-1.94%)	⬇️

... and 2 files with indirect coverage changes